ludicrous/ridiculous

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. It is ludicrous/ridiculous to call a cottage a mansion.
  2. That’s a ludicrous/ridiculous idea.
  3. It was ludicrous/ ridiculous that this should be so difficult to say.
  4. She looks ludicrous/ ridiculous in that hat.
    Are these sentences OK with both options?
    If not correct them.
    Thanks.
2

They are okay. The words are usually synonyms.